Doesn't sound stupid at all. I'm just very happy to see you had it work for you. Sometimes the spirits will play tricks and sometimes they'll just be plain wrong. Other times they can be highly accurate. If you were comfortable, more than likely this spirit wasn't purposely trying to trick you into anything but you never know. Even true psychics are sometimes wrong and they're using pretty much the same intuitive powers the spirits use. I always say, "I'll believe it if it happens." If you sit back and let things flow naturally everything may turn out just as he said. The "7 past lives" part I would take as either wrong or misinterpreted. This should be somewhere around the 700-7000 mark but he could also be saying you've spent the last 7 lives together. Being reborn can also be thought of not just when the child's body comes into the world, but at the time the spirit enters the new fetus, usually within the first couple months after conception, I believe - if not right away. If you talk to your friend again, see if you can find out more. Eventually you may notice some things really did happen as foretold but just as many - if not more - kind of passed by. I guess it all depends on the spirit and how well they are at reading the future.
I'd love to hear more when the time comes. Feel free to let me know what happens.
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